- Miners are not "all" united, and either way – miners will mine the profitable chain no matter what they signal, BCH was proof of that
- Users seem to be overwhelmingly in favor of following the recommendation of the Core developers and NOT adopting Segwit 2x
- Segwit was activated on BTC, but 2x has not been yet and is slated for Nov17-18 – 2x is supported by most miners and exchanges but opposed by the Core developers. as a result of this corporatist influence, the Segwit2x coin is being derisively labeled "bizcoin"
I'd say it's certainly not a foregone conclusion, but it's safe to say this is going to be nothing like BCH was. If the hashrate is largely united, plus if 2x doesn't implement replay protection and there are enough supporting non-mining full nodes to relay 2x transactions effectively, it's possible that users running SPV wallets, whatever their vocal preference might be, might just be swept along into the 2x chain. In such a scenario, they'd need to run a full node enforcing the SegWit-Only ruleset in order to remain on what might turn out to be a minority SegWit-Only chain. Some of those users will have neither the resources or/nor the inclination to do so. It's also possible that due to the difficulty adjustments taking a bit of time to occur, attempting to transact on a minority chain after the fork could be potentially very slow and inconvenient. Many might just follow the path of least resistance and "whatever works". If you feel strongly against 2x and are willing to endure some slow confirmation times to support Core's vision, you ideally need to be running a full node, just to be on the safe side.
And while SPV users are potentially passengers in all this, there's also the question of those relying on "trusted" third parties to store their coins. They're definitely passengers and have very little say in any of this. Sadly, I think there are more of those users than there should be. Literally everyone here was born into a world where it's considered normal to trust other people with the task of looking after your money and not everyone seems to be able to break the habit. Many of them may have a decision made for them that they don't agree with.
But no one knows exactly what's going to happen. It's very much a case of "wait and see" at this stage.